Android 6.0区别U盘和SD卡设备的方法详解

如下所示：

public static boolean isSdcardExists(Context context) {

StorageManager storageManager = StorageManager.from(context.getApplicationContext());
 List<VolumeInfo> volumes = storageManager.getVolumes();
 for (VolumeInfo volInfo : volumes) {
  DiskInfo diskInfo = volInfo.getDisk();
  if (diskInfo != null && diskInfo.isSd()) {
   String sdcardState = volInfo.getEnvironmentForState(volInfo.getState());
   if (Environment.MEDIA_MOUNTED.equals(sdcardState)) {
    return true;
   }
  }

}
 return false;
}

public static int isudiskExists(Context context) {
 int num = 0;
 StorageManager storageManager = StorageManager.from(context.getApplicationContext());
 List<VolumeInfo> volumes = storageManager.getVolumes();
 for (VolumeInfo volInfo : volumes) {
  DiskInfo diskInfo = volInfo.getDisk();
  if (diskInfo != null && diskInfo.isUsb()) {
   String sdcardState = volInfo.getEnvironmentForState(volInfo.getState());
   if (Environment.MEDIA_MOUNTED.equals(sdcardState)) {
    num++;
   }
  }

}
 return num;
}

来源：https://blog.csdn.net/wuqingyidongren/article/details/62229256